Hi there, @NoGoodSoftware.
I'm here to help share some information regarding your custom template concern.
We currently have an ongoing issue wherein Print Preview of an Invoice created is not applying the Custom Template. Our engineers are still working to get this issue resolve as timely as possible. Since you've already contacted our support rest assured that you'll be able to receive a notification about the status of the issue.
Additionally, I'll keep an eye out for updates and provide them as soon as they're made available to me. Thank you for your patience while this was being worked on.
Please know that I'm just a post away should you need anything else concerning QuickBooks. I want to make sure you're taken care of. Have a wonderful day.
